01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing overhang on sides for easy removal.
02 - Combine flour, brown sugar, and salt in a mixing bowl. Cut in cold butter using a pastry blender or fork until mixture resembles coarse crumbs. Press firmly and evenly into the bottom of the prepared pan.
03 - Bake crust for 10 minutes until lightly set. Remove from oven and set aside while preparing filling.
04 - Whisk together pumpkin puree, maple syrup, brown sugar, eggs, pumpkin pie spice, vanilla extract, and salt in a separate bowl until completely smooth and well combined.
05 - Pour pumpkin filling evenly over the warm par-baked crust. Use a spatula to spread into an even layer.
06 - Mix flour, brown sugar, cinnamon, salt, and melted butter in a bowl until crumbly and combined.
07 - Sprinkle streusel mixture evenly over the pumpkin filling. Bake for 30 minutes until the center is set and the topping is golden brown.
08 - Cool completely in the pan on a wire rack. Once fully cooled, lift out using parchment paper overhang and cut into 16 bars.